Endpoint to retrieve user build history

[munishchouhan]

Create Endpoint to get builds created by user

@ewels what should be in the response, just the build ids or more?

[ewels]

I think build IDs as a minimum - it would be nice if we could also return a small amount of additional information if it's not too much of a performance hit.

Basic info I would consider to be:

• Build ID
• Security scan ID
• Image URI
• Build date
• Type (docker / singularity)
• Arch

None of this is essential though, as it can all be looked up in secondary API calls if needed. I'm mostly thinking ahead to a future web page that could list images built by a user in a list view (with click through to a details page that can use a second API call).

[munishchouhan]

@ewels thanks for the details, I am handling for build details per image name and build per user in this PR
#544